George wrote:
Robert Gammon wrote:


As with most things in life, there is a tradeoff here.

Depending on the situation, up to 15,000 gallons a year of water that
would otherwise flow down the drain while you wait for the hot water to
arrive will be saved as hot water will be virtually instant on every
time. That's on the order of $60 or more per year in water/sewer costs
saved (exactly how much depends on where you live). The pump will
consume maybe $10 of that in a year. The extra utility costs in keeping
the water at a usable temp in the hot water lines during usage hours is
hard to quantify but lets say its an extra $15 a year.


I would imagine that would be an interesting situation. Perhaps whomever
wrote the marketing material for the pump got a little carried away?


I suspect that they assumed

1. household of 4 people.
2 6 showers a day on average.
3 4-6 loads of clothes washing per week.
4. Two or more loads of the dishwaher per day with hot water into the
dishwasher. 5. Cold water so cold that you ALWAYS turn on the hot
water to mix with it when you run water into a sink

My cold water is about 65-70 degrees year round. To get COLD water, it
must come out of the fridge, or be over ice.